无机双液材料优化配比试验研究及固煤性能评价

    Experimental study on optimal ratio of inorganic double liquid materials and evaluation of coal fixing performance

    • 摘要: 为寻求无机双液材料的最优配比,改善材料的固煤效果,立足于马丽散注浆固煤壁机理,选用流动性、凝结时间、抗压强度、黏结强度等四因素为评价参量,采用单因素调控的方法开展材料配比优化试验。研究结果表明:水灰比、石灰石膏比、减水剂掺量、悬浮剂掺量分别取0.7、1∶7、0.25%和0.3%时无机双液材料的注浆加固性能可达最优;材料配比优化前后注浆加固煤体的变形趋势一致,在压缩条件下都先后经历压密、弹性、屈服、破坏四个阶段,但优化后胶结煤体的抗载荷能力和抗变形能力都明显得到提升;单轴压缩、三轴压缩条件下胶结煤体多产生压剪−拉伸−摩擦混合型破坏,且优化后材料加固的煤体破碎后出现煤块断裂的现象,进一步揭示优化后的无机双液材料固煤效果较佳。优化后的无机材料虽然难以达到马丽散注浆加固的效果,但可规避反应温度高、价格高、制备难度大等缺点,可为煤壁注浆加固材料的研究提供参考。

       

      Abstract: In order to find the optimal ratio of inorganic double liquid materials and improve the coal fixing effect of materials, based on the mechanism of coal wall reinforcement, four factors such as fluidity, setting time, compressive strength and bond strength are selected as evaluation parameters. Then the optimization experiment of material ratio is carried out by single factor control method. The results show that when the ratio of water to cement, the ratio of lime to gypsum, the content of water reducing agent and the content of suspension agent are 0.7, 1∶7, 0.25% and 0.3% , respectively, the performance of the inorganic double liquid materials can reach the best. The deformation trend of coal reinforced by grouting before and after the optimization of material ratio is the same, and the four stages of compaction, elasticity, yield and failure are successively experienced under compression conditions, but the load resistance and deformation resistance of the cemented coal after optimization are obviously improved. Under uniaxial and triaxial compression conditions, the consolidated coal mostly produces compressor-tension-friction mixed failure, and the coal block fracture occurs after the optimized material reinforcement, which further reveals that the optimized inorganic double liquid material has better coal consolidation effect. Although the optimized inorganic material is difficult to achieve the effect of Marisan grouting reinforcement, it can avoid the shortcomings of high reaction temperature, high price and difficult preparation, which can provide a reference for the research of coal wall grouting reinforcement materials.

       

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